"use client";

import Image from "next/image";
import { useState } from "react";

import { saveGuideOverview } from "@/app/admin/actions";
import { AutosaveStatus } from "@/components/admin/autosave-status";
import { MediaUploader } from "@/components/admin/media-uploader";
import {
  Card,
  CardContent,
  CardDescription,
  CardFooter,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import {
  Field,
  FieldDescription,
  FieldError,
  FieldGroup,
  FieldLabel,
} from "@/components/ui/field";
import { Input } from "@/components/ui/input";
import { Textarea } from "@/components/ui/textarea";
import { useAutosave } from "@/hooks/use-autosave";
import { adminDraftKey } from "@/lib/editor/local-draft";
import { parseYouTubeUrl } from "@/lib/guides/youtube";
import { cn } from "@/lib/utils";

export function GuideOverviewForm({
  guide,
}: {
  guide: {
    id: string;
    version: number;
    overview: string;
    youtubeUrl: string | null;
    coverMediaId: string;
    coverUrl: string;
    name: string;
  };
}) {
  const [overview, setOverview] = useState(guide.overview);
  const [youtubeUrl, setYoutubeUrl] = useState(guide.youtubeUrl ?? "");
  const [cover, setCover] = useState({
    id: guide.coverMediaId,
    url: guide.coverUrl,
  });
  const youtubeVideo = parseYouTubeUrl(youtubeUrl.trim());
  const invalidYoutubeUrl = Boolean(youtubeUrl.trim() && !youtubeVideo);
  const value = { coverMediaId: cover.id, overview, youtubeUrl };
  const incompleteIssues = [
    !cover.id ? "กรุณาอัปโหลด Guide Image" : null,
    !overview.trim() ? "กรุณากรอก Overview" : null,
    invalidYoutubeUrl ? "กรุณาใส่ลิงก์วิดีโอ YouTube ที่ถูกต้อง" : null,
  ].filter((issue): issue is string => Boolean(issue));
  const invalidCover = !cover.id;
  const invalidOverview = !overview.trim();
  const localDraft = { overview, youtubeUrl, cover };
  const autosave = useAutosave({
    value,
    valid: Boolean(cover.id && overview.trim() && !invalidYoutubeUrl),
    initialVersion: guide.version,
    persist: (next, expectedVersion) =>
      saveGuideOverview(guide.id, { ...next, expectedVersion }),
    storageKey: adminDraftKey(guide.id, "overview"),
    localDraft,
    parseLocalDraft: (candidate) => {
      if (!candidate || typeof candidate !== "object") return null;
      const draft = candidate as Record<string, unknown>;
      if (
        typeof draft.overview !== "string" ||
        !draft.cover ||
        typeof draft.cover !== "object"
      )
        return null;
      const draftCover = draft.cover as Record<string, unknown>;
      if (
        typeof draftCover.id !== "string" ||
        typeof draftCover.url !== "string"
      )
        return null;
      if (
        draft.youtubeUrl !== undefined &&
        typeof draft.youtubeUrl !== "string"
      )
        return null;
      return {
        overview: draft.overview,
        youtubeUrl:
          typeof draft.youtubeUrl === "string" ? draft.youtubeUrl : "",
        cover: { id: draftCover.id, url: draftCover.url },
      };
    },
    restoreLocalDraft: (draft) => {
      setOverview(draft.overview);
      setYoutubeUrl(draft.youtubeUrl);
      setCover(draft.cover);
    },
  });
  return (
    <Card>
      <CardHeader>
        <CardTitle>Overview</CardTitle>
        <CardDescription>
          ภาพ ข้อความ และวิดีโอนี้แสดงบนหน้าแรกของ Guide
        </CardDescription>
      </CardHeader>
      <CardContent>
        <FieldGroup>
          <Field data-invalid={invalidCover}>
            <FieldLabel>Guide Image</FieldLabel>
            <div className={cn(
              "relative mx-auto aspect-square w-full max-w-md overflow-hidden rounded-lg border",
              invalidCover && "border-destructive",
            )}>
              <Image
                src={cover.url}
                alt={`Guide ${guide.name}`}
                fill
                className="object-cover"
              />
            </div>
            <MediaUploader onReady={(asset) => setCover(asset)} />
          </Field>
          <Field data-invalid={invalidOverview}>
            <FieldLabel htmlFor="guide-overview">Overview</FieldLabel>
            <Textarea
              id="guide-overview"
              value={overview}
              aria-invalid={invalidOverview}
              maxLength={500}
              onChange={(event) => setOverview(event.target.value)}
            />
            <FieldDescription>{overview.length}/500 ตัวอักษร</FieldDescription>
          </Field>
          <Field data-invalid={invalidYoutubeUrl}>
            <FieldLabel htmlFor="guide-youtube-url">
              YouTube video link
            </FieldLabel>
            <Input
              id="guide-youtube-url"
              type="url"
              inputMode="url"
              value={youtubeUrl}
              maxLength={2_048}
              placeholder="https://www.youtube.com/watch?v=..."
              aria-invalid={invalidYoutubeUrl}
              onChange={(event) => setYoutubeUrl(event.target.value)}
            />
            <FieldDescription>
              ไม่บังคับ รองรับลิงก์ YouTube, youtu.be, Shorts และ Live
            </FieldDescription>
            {invalidYoutubeUrl ? (
              <FieldError>กรุณาใส่ลิงก์วิดีโอ YouTube ที่ถูกต้อง</FieldError>
            ) : null}
            {youtubeVideo ? (
              <div className="aspect-video w-full overflow-hidden rounded-xl border bg-muted">
                <iframe
                  src={youtubeVideo.embedUrl}
                  title={`ตัวอย่างวิดีโอไกด์ ${guide.name}`}
                  loading="lazy"
                  allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share"
                  referrerPolicy="strict-origin-when-cross-origin"
                  allowFullScreen
                  className="size-full"
                />
              </div>
            ) : null}
          </Field>
        </FieldGroup>
      </CardContent>
      <CardFooter className="justify-end">
        <AutosaveStatus
          state={autosave.state}
          issues={incompleteIssues}
          onSave={autosave.saveNow}
        />
      </CardFooter>
    </Card>
  );
}